Bitcoin ABC  0.24.7
P2P Digital Currency
sha3.h
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1 // Copyright (c) 2020 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 
5 #ifndef BITCOIN_CRYPTO_SHA3_H
6 #define BITCOIN_CRYPTO_SHA3_H
7 
8 #include <span.h>
9 
10 #include <cstdint>
11 #include <cstdlib>
12 
14 void KeccakF(uint64_t (&st)[25]);
15 
16 class SHA3_256 {
17 private:
18  uint64_t m_state[25] = {0};
19  uint8_t m_buffer[8];
20  unsigned m_bufsize = 0;
21  unsigned m_pos = 0;
22 
24  static constexpr unsigned RATE_BITS = 1088;
25 
27  static constexpr unsigned RATE_BUFFERS = RATE_BITS / (8 * sizeof(m_buffer));
28 
29  static_assert(RATE_BITS % (8 * sizeof(m_buffer)) == 0,
30  "Rate must be a multiple of 8 bytes");
31 
32 public:
33  static constexpr size_t OUTPUT_SIZE = 32;
34 
35  SHA3_256() {}
38  SHA3_256 &Reset();
39 };
40 
41 #endif // BITCOIN_CRYPTO_SHA3_H
SHA3_256::OUTPUT_SIZE
static constexpr size_t OUTPUT_SIZE
Definition: sha3.h:33
SHA3_256::Finalize
SHA3_256 & Finalize(Span< uint8_t > output)
Definition: sha3.cpp:232
SHA3_256::m_bufsize
unsigned m_bufsize
Definition: sha3.h:20
SHA3_256::m_buffer
uint8_t m_buffer[8]
Definition: sha3.h:19
SHA3_256
Definition: sha3.h:16
SHA3_256::Reset
SHA3_256 & Reset()
Definition: sha3.cpp:245
Span
A Span is an object that can refer to a contiguous sequence of objects.
Definition: span.h:83
SHA3_256::m_state
uint64_t m_state[25]
Definition: sha3.h:18
SHA3_256::m_pos
unsigned m_pos
Definition: sha3.h:21
span.h
SHA3_256::SHA3_256
SHA3_256()
Definition: sha3.h:35
SHA3_256::RATE_BUFFERS
static constexpr unsigned RATE_BUFFERS
Sponge rate expressed as a multiple of the buffer size.
Definition: sha3.h:27
KeccakF
void KeccakF(uint64_t(&st)[25])
The Keccak-f[1600] transform.
Definition: sha3.cpp:23
SHA3_256::RATE_BITS
static constexpr unsigned RATE_BITS
Sponge rate in bits.
Definition: sha3.h:24
SHA3_256::Write
SHA3_256 & Write(Span< const uint8_t > data)
Definition: sha3.cpp:202